Expansion-bolt.



D. W. BENNETL EXPANSION BOLT.

APPLICATION man sEPT.21,191s.

Lm l hmmm Nov. 2?, 1917.

2 SHEETS-SHEET 1.

www fg ik h @im 5.152 .mi m.

www tof D. W. BENNETT.

EXPANSION BOLT.

Ammo/umu msn sfmzx. 191e.

Patented Nov. 27, 1917.

2 SHEETS-SHEET `2- @Mofa/m m o marin earns arend DWIGHT WILSON BENNETT, OF SOMERTON, PENNSYLVANIA.

EXPANSION-BOLT.

Specification ofi-Letters iatent.

Patented Nov.. 2'?, 1193i W.,

Application led September 21, 1,916. s @l'ial N o. 121,500.

To all 'whom #may concern.'

Be it known that l, DWIGHT WILSON BEN- NETT, a citizen of the United States, residing at Somerton, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements'in Expansion-Bolts; and I do declare the following to be a full, clear, and exact description of the invention, such as will yenable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in expansion bolts and has for its object to provide a simply constructed and eflicient device of this character which notonly provides Vfor a quick expansion but for its embodiment in a short bolt.

Another object is to provide a quick `acting device of this character having expansion elements ,mounted to exert their pulling action in a direction opposite to the direction in which the holt is inserted and by means of which a positiveand reliable grip isefi'ected.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combmation `and arrangement .of parts and 1n the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without ldeparting from the spirit of the invention.

`the position shown in Fig. 2;

Fig. v5 is a side elevation showing the parts in closed inoperative position;

Fig. 6 isa similar view with the'parts in operative engaged position;

' Fig. i7 is a transverse'section taken .0n the line 7.-?? v,of f2;

preferably adjacent one end thereof. The

Fig. 8 isa similar view taken on the line 8-8 of Fig. l5;

Fig. 9 isa side elevation of the nut detached;

Fig. l0fis a transverse section taken on the line 10-10 of Fig. 9;

Fig. .11 is a detail perspective view `of one of the expansion wings or gripping elements; and,

Fig. 12 is a detail perspective view of one end of the sleeve which carries the expansion wings.

In the embodiment illustrated, a bolt 1 is shown of ordinary construction having ythe `usual head 2 and with which a nut 3 .has

threaded engagement and `is designed to move on the bolt on the turning of the latter and its .direction of `movement being controlled by the direction the bolt is turned, the bolt being turned to the right for moving the .nut inward thereon and to the left for moving it outward. This nut 3 is of elongated cylindrical formhaving undercut lugs 4 disposedat diametrically opposite points,

side walls of this nut are cut-away for about one-half its length more or less, as shown at 5, andextending inwardly from the end of the vnut in which these cut-(away portions are formed are two triangular ears or lugs twhich extend longitudinally inward with' their apices 7 extending toward the lugcarrying end of the nut and which ,are designedfor a purpose to be hereinafter described.

A sectional sleeveor casing 8 encircles the `nut 3 and .in which .said nut is designed to move on the turning of the bolt 1, the nut moving inward when the bolt is turned toward the right and outward when yturned toward the left. This sleeve as shown isV `formed of .two semi-cylindrical sections 9 and 10, one provided with laterally extending circumferential tongues 1l and the other with recesses 12 into which said tongues are designed to fit for holding the sections in closed operative position, the tongues being ductile and adapted .to be Vpressed into said recesses when the parts are assembled. These sections V9 and 10 `are provided with longitudinally extending under-cut slots 13 `having enlarged portions 1li formed midway their ends through which the lugs 4 are designed to be inserted lugs s lidably engage the slots and are ,desillgneil for holdy ing the nut securely within the sleeve and preventing it from accidental detachment.

These sleeve or casing sections 9 and 10 are provided at their outer ends with inward longitudinally extending recesses 15 which open through the outer end of the sleeve sections, the recess in one section being disposed opposite that in the otherwhen the parts are assembled and which are shaped to receive expanding elements in the form of angular wings 16 which are pivotally mounted on the outer ends of the sleeve sections and are adapted to close into said recesses when the bolt is in operative position. These wings 16 and the recesses in which they are designed to be seated are of substantially truncated triangular form with their truncated apices extending outward, pintles or studs 17 being formed at the truncated ends of the wings and extending laterally therefrom and which are designed to be pivotally engaged with bearings 18 arranged at the outer end of the sleeve sections on opposite sides of the recesses 15. These expanding elements or wings when so mounted are designed to swing laterally outward when in operative position as shown in Figs. 2 and 4 and to seat in the recesses 15 when in closed inoperative position as shown in Figs. l, 3 and 5. The free ends of these wings 16 are beveled and the inner ends of the recesses 15 are correspondingly beveled so that when engaged by the beveled ends of the wings, the latter will be limited in their closing movement thereby. These expansion elements or wings 16 are provided with longitudinally extending reinforcing ribs 19 which terminate at their outer ends in beveled noses 2O which project beyond the truncated cone-shaped pintle carrying end of said wings and are designed to extend into the path of the pointed lugs 6 carried by the nut 3 so that when the nut is movedY inwardly by the turning of the bolt toward the right, these pointed lugs 6 will be brought into engagement with the noses 20 on the wings 16 as shown clearly in Figs. 4 and 6 and thereby cause said wings to swing outwardly in opposite directions as shown in Figs. 2, 4 and 6 to bring their free biting edges 16 into locking engagement with the opposed side walls of the opening O in which the bolt is designed to be mounted whereby said expansion elements exertV their pulling action in a direction opposite to the direction of the outward movement of the bolt so that they will reliably hold the bolt in its socket when once engaged therewith. The inclined edgesf6 of the lugs 6 are designed to engage the outer ends of the sleeve and limit the opening movement of the wings.

In the use of this improved expansion bolt, which is especially designed for use on ceramic material although obviously it may be used in connection with any other material,

the sleeve is first engaged with the nut. 3 and secured thereto by bending the ductile tongues 11 into the recesses 12 and the combined casing and nut are then placed within the hole O formed in the wall vor other support in which the bolt is designed to be inserted. The bolt is then inserted through an aperture formed in the objecto to be secured to the wall and is then screwed into the nut 3. Turning of the bolt toward the right causes the nut to :feed outward along the screw-threaded portion'of the bolt toward the head thereof. This feeding of the nut brings the wing or jaw-opening elements 6 thereof into engagement with the projecting noses 20 of the expanding jaws or wings 16 causing said wings to swing outwardly on their pivots and their free biting edges to securely grip the walls of the opening O as shown clearly in Figs. 2 and 4. 1t will thus be obvious that the object o to be secured by the bolt will be reliably held and connected to the wall and cannot be removed until the bolt is turned in the opposite direction to move the nut 3 inward on the bolt 1 thereby permitting the wings 16 to swing inward into closed position which may be accomplished by moving the bolt outward in the opening O a suiiicient distance to cause this movement. The bolt with its expansion elements engaged therewith may then be removed rom the opening.

By constructing the bolt in the manner voted on said member to swing outwardly,

and coperating projections on said elements and nut, said projections being movable into engagement for swinging said elements outwardly on the inward movement of said nut on said bolt.

2. A bolt having a nut threaded thereon, a sleeve to surround the nut, means at the inner endof the nut and sleeve to prevent rotation of one with respect to the other, a bearing at the outer end of the sleeve, a biting wing pivoted at one end of said bearing and adapted to have its other end swing outwardly, and means carried by said nut to engage and actuate said element in an outward direction on the inward movement of the nut on the bolt. i

3. A bolt having anut threaded thereon, a sleeve loosely encirclingsaid nut and in which said nut is movable, laterally opening gripping wings fulcrumed on said sleeve, and having laterally extending noses positioned in the path of said nut whereby said wings are swung laterally outward on the inward movement of the nut.

4. A bolt having a nut threaded thereon, a sleeve on said nut and a pivoted biting element carried by the sleeve and actuated to swing outward into open position by the nut on its inward movement.

5. A bolt having an elongated cylindrical nut threaded thereon and with oppositely disposed cut out portions at one end, lugs extending longitudinally of said nut from the outer end walls of said out out portions, a sleeve encircling said nut, biting elements pivoted on said sleeve and having noses positioned in the path of the lugs on said nut whereby the biting elements are swung outward to operative position on the inward movement of said nut on said bolt.

6. A bolt having an elongated cylindrical nut threaded thereon and with oppositely disposed cut out portions at one end, triangular lugs extending longitudinally of said nut from the outer end walls of said cut out portions with their apices extending inward, a sleeve encircling said nut and having wings pivoted thereto with their free ends extending toward the bolt head, and outwardly inclined noses on the inner faces of the fulcrum ends of said wings, said noses extending into the path of the luOs on said nut.

I. A bolt having a nut threaded thereon and formed with cut out portions having longitudinally projecting lugs therein, a

sleeve slidably but non-rotatably mountedl DWIGHT WILSON BENNETT.

Witnesses ALBERT Gr. KRUL, EMILIE F KRULL.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner oi Patente, Washington, D. C. 

